Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce081c6ede7f31e…

MALICIOUS

PDF

88.4 KB Created: 2021-03-12 17:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f3fe2f861076e2616265d0c09f78a9e SHA-1: 2861b8b0b06a88df8ae14530a2072892b03e9e06 SHA-256: 3ce081c6ede7f31e6e23c9b42d07136f09d4eaf6b091ad75092b2d2bface8d1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and one specific URL, https://vilenefex.ru/award?keyword=healthy+fruit+smoothie+recipes+pdf, is directly associated with the document's apparent theme. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/award?keyword=healthy+fruit+smoothie+recipes+pdf
    • https://cdn-cms.f-static.net/uploads/4367300/normal_603b0d11eda86.pdf
    • https://cdn-cms.f-static.net/uploads/4367927/normal_60152f866a540.pdf
    • https://static.s123-cdn-static.com/uploads/4461481/normal_5fcd85615b43f.pdf
    • http://watogoda.mypressonline.com/how_to_factory_reset_an_ipod_nano_4th_generation.pdf
    • https://cdn-cms.f-static.net/uploads/4454813/normal_604a89e433664.pdf
    • http://idealica-ordina.site/moto_g6_plus_frp_unlockbmpcq.pdf
    • http://smartcoin.design/boi_dd_formos49o.pdf
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5ffd3f8c95553.pdf
    • http://koreanluxe.com/81998190174t0i7x.pdf
    • https://cdn-cms.f-static.net/uploads/4490953/normal_6037a09f02b8e.pdf
    • https://cdn-cms.f-static.net/uploads/4393483/normal_6034446718eb4.pdf
    • http://lnstagramservicecopyrights.com/que_relacion_existe_entre_la_educacion_fisica_y_el_deporteo1gn8.pdf
    • http://fogejebimo.scienceontheweb.net/probiotics_review_article.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_6a1b7c8b4dae404394beb12f0ea116ce.pdf?index=true
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_64632d77762b4974b61e0b0e44d5044a.pdf?index=true
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_3b5a73899a834eeea31d43470d96d7fe.pdf?index=true
    • http://rususekobijo.myartsonline.com/27717834437.pdf
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_a5666b59541041bdb50bd8a07d6aba6e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e55.bin
de0d3d2f25842ea9250ced2d0de50107c43efb4e8da1af4566a20ba1bd6b8f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 5456 bytes
font_01_sfnt_off000130c0.bin
fb1fcd2924e8dec321807ac63f97a76b5dfed78cfb8ca636972444dea76c56df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 10504 bytes

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